Already Register GSF ID But Device Isn't Google Play Protect Certified Yet
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If the verification process is not successful after you follow the steps in the video, please try the following steps before going through the same process again.
Go to Apps > App Management > App Info > Show system, find Google Play services, Google Play Store, Google Services Framework, then tap each of them and then tap storage & Cache to clear storage of all the 3 apps. Once finished, please restart the registration process again.